Charles smith



' (No Model.

0.. SMITH.

LATHE.

Patented Aug. 9, 1887 Eiyl.

UNITED STATES;

' PAfrE-NT OFFICE.

CHARLES SMITH, OF BELLEVILLE, NEW JERSEY.

. LATHE.

s ecimen-101v forming part of Letters Patent No. 368,021, dated August9, 1887.

Application filed Aplll 2i,'1se7. Serial messa e. (No model.)

To all whom it may concern: Q

Be it known that I, OHARLEsSMITH, a citizen of the United States, and aresidentof Belleville, in the county of Essex and State of New Jersey,have invented certain new and useful Improvements in Lathes, of whichthe following is a specification.

The inventionrelates to improvements in lathes, and particularly toimprovements in that part of the lathe known as the live head andtail-stock, whereby the necessity of placing risers beneath said partsfor the purpose of securing additional space between the bed,of themachine and the centers which hold the material being treated may beobviated and other advantages attained, among which maybe mentioned thefact that by means of the invention the face of the work during theturning of large bodies is brought into the best and strongest positionwith reference to the tool in the rest for the attainment of the mostperfect action of the same.

The invention also involves a means whereby either large or small workmay be treated in the one lathe, and also mechanism whereby, when thecenters are used which give the largest swing, the power revolving thework may be increased and its speed reduced.

The invention will be more fully understood by reference to theaccompanying drawings, in which- Figure 1 is an elevation of a lathe,looking toward the rear side of thesame. Fig. 2 is an end elevation,partly in section, of the live-head, the View being taken in thedirection of the arrow pointing to the right in Fig. 1. Fig. 3 is anelevation of the opposite end of the live-head to that illustrated inFig. 2.

- Fig. 4 is an end view of theupper part of the tail-stock, the viewbeing taken in the direction of the arrow pointing to the left in Fig.1.

In the accompanying drawings, A denotes the bed of the lathe, which willbe of the usual construction; B, the live-head, and G the tailstock, thetwo latter elements being arranged upon the top of the bed according tothe usual and customary methods, with the exception that it is notintended at any time to employ risers. The tool-rest is not shown, sinceit forms no part of the present invention and because the ordinarytool-rest now in use is adapted for. employment in connection with thelathe illustrated without change.

The live-head consists of the casting shown, having at each end thestandardsD E, between which are mounted the spindles F G,which arehollow and adapted to receive the usual form of center at the inner endfacing the tool-rest. The right-hand end of the spindle G, carrying thecone .T, is provided with a pinionwheel,

H,(shown by dotted lines in Fig. 3,) which is engaged by the toothedspur-wheel I, secured on the shaft W and forming a part of the usualback gear. The standards D E extend upward and rearward of the spindleG, as may be seen by reference to Figs. 2 and 3, and at their upper endsustain the spindle F, which is a new element in the live-head. Thespindle F is similar to that lettered G, and the face-plate L upon thefront end of the same has a toothed periphery, which engages the pinionM, secured upon the front portion of the spindle G, as illustrated inFigs. 1 and 2. The inner extremity of the spindle F terminates in closerelation to the face of the toothed plate L, as shown in Fig. 1, whilethe corresponding end of the spindle G projects forward of the pinion M,in order that said end of the latter spindle may receive a face-plate ofthe usual form without the same, when in use, coming into contact withthe end ofthe spindle F.

It will be observed that the motion imparted to the cone J iscommunicated, through the pinion H, spur-wheel I, shaft NV, and pinionM, to the face-plate L and spindle F,whereby the material for treatmentmay be caused to revolve when the lathe is in use.

The tail-stock O is provided with bearings N 0, corresponding inposition with the bearings in the live-head B for the spindles F G, andin the bearings N O are placed the spindles P Q, of usual form, adaptedto receive the centers for holding the material being treated. Thespindles N O are of usual construction, and are adapted to be operatedin the customary and well-known manner. The lower spindle, Q, is in linewith the spindle G, and the upper spindle, 1?, extends to the rear ofthe spindle Qand on a higher elevation and is in line with the spindleF.

In Fig. 1 1 illustrate in dotted lines a piece of material held betweencenters in the spin- (lles P and F, which will be the centers used whena large diameter is to be turned. \Vhen, however, a body of smalldiameter is to be treated, it will be secured on centers between thespindles Q and G. It will thus be seen that the lathe is adapted toreceive either a large or a small diameter between its centers withoutthe employment of risers.

It should be noted that the centers provided to receive abody of largediameter areloeated to the rear of and at a higher elevation than thelower centers, and this arrangement is important, since thereby thesurface of the large diameter is brought into such position withrelation to the tool-rest that the latter may remain in the mostappropriate position for use in turning. It should also be noted thatthe proportions of the gear-wheels L M are such with relation toeachother that when the.

work is between the higher centers the power will be increased while thespeed will be reduced.

WhatIelaim as my invention, and desire to secure by Letters Patent, is

1. In a lathe, the live-head provided with the spindles F G, the formerbeing on a higher elevation than the latter, substantially as set forth.

2. In a lathe, the live-head provided with the spindles F G, one beingon a higher plane than the other, combined with the tail-stock havingspindles corresponding in position with thosein the li ve-head,substantially as set forth.

3. In alathe, the live-head provided with Spindles F G, one being on ahigher plane than and to the rear of the other, and connected by gearingwhich operates to increase the power and reduce the speed of the higherspindle, substantially as set forth.

4-. In a lathe, the live-head provided with spindles F G, one being on ahigher plane than and to the rear of the other, and the two beingconnected by gearing, substantially as set forth.

Signed at New York, in the county of New York and State of New York,this 16th day of April,.A. D. 1887.

CHARLES SMITH.

\Vitnesses:

CHAS. C. GILL, W. A. O. llIATTHIE.

